Tomioka, Gunma
city in Gunma Prefecture, Japan
Tomioka (富岡市, Tomioka-shi) is a city located in Gunma Prefecture, Japan. As of 1 September 2020, the city had an estimated population of 57,013 in 20,367 households, and a population density of 390 persons per km2. The total area of the city is 122.85 square kilometres (47.43 sq mi). It is the location of the Tomioka Silk Mill, a UNESCO World Heritage Site.
Geography
Tomioka is located in the southwestern portion of Gunma Prefecture.
Mountains: Mount Myōgi (1103m)
Rivers: Kabura River
Lakes: Oshio Dam
Surrounding municipalities
Gunma Prefecture
Annaka
Kanra
Shimonita
Takasaki
Climate
Tomioka has a Humid continental climate (Köppen Cfa) characterized by warm summers and cold winters with heavy snowfall. The average annual temperature in Tomioka is 13.8 °C. The average annual rainfall is 1207 mm with September as the wettest month. The temperatures are highest on average in August, at around 26.1 °C, and lowest in January, at around 2.4 °C.
Demographics
Per Japanese census data, the population of Tomioka has remained relatively steady over the past 60 years.
History
Tomioka is located within traditional Kōzuke Province. During the Edo period, the area of present-day Tomioka was part of the tenryō territory under the direct control of the Tokugawa shogunate.
This brief starts where responsible research should: with the source description of “Tomioka, Gunma” as city in Gunma Prefecture, Japan. Everything that follows is an evidence route, not borrowed authority.
Why this record matters
The subject matters to the places & architecture register because the source frames it as city in Gunma Prefecture, Japan. Its deeper value depends on whether names, dates, institutions and citations support that framing.
Place names and jurisdictional language are key evidence: both can reveal earlier catalogue descriptions and overlooked record series. The source revision retrieved here is dated Sep 17, 2026. The linked authority identifier is Q873835. VIAF identifies the subject as 251735391. The Library of Congress control number is n81092438. Authority coordinates are 36.260, 138.890. 3 of 6 selected statements include explicit references; 1 carry qualifiers and 1 use preferred rank. The first chronological checks are 2020 and 1207.
Modern boundaries and familiar names can conceal earlier jurisdictions or structures that do not align with the present site. The source lead contains qualifying language; that uncertainty should survive quotation, summary and reuse. Authority statements aid reconciliation but still require their own references, qualifiers and ranks to be checked.
How to read it
Treat names, boundaries and functions as historically changeable. Maps, plans, inventories and administrative records can clarify what the place meant at different dates.
- Historic place names
- Jurisdictional context
- Routes into maps and plans
Contemporary maps, plans, listed-building records, estate papers and the responsible local or national archive.
Three-step research path
- Establish the record: confirm the title “Tomioka, Gunma”, its source revision and the description used here.
- Expand the search: follow Tomioka, Gunma primary sources, Tomioka, Gunma archive and Tomioka research across catalogues and specialist indexes.
- Test the account: compare the strongest cited source with the responsible institution’s current record and note any disagreement.
Questions for further research
- Which source most directly establishes the central claim about “Tomioka, Gunma”?
- Which authority defined the place, boundary or structure at the relevant date?
- What physical evidence or contemporary plan supports the description?
Search terms from this dossier
This entry incorporates text from “Tomioka, Gunma” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.